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Perl: The Complete Reference
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gmtime; print "Date is: ",join('/',$tm_mday,($tm_mon+1),($tm_year+1900)),"\n";
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The time variables will not be updated until gmtime is called again You can access the original CORE::gmtime function in a scalar context using the new gmctime function:
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print gmctime(time);
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To use the object-oriented interface without overriding the CORE::localtime function, import the module with an empty import list, and then call the functions explicitly:
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use Time::gmtime qw//; $time = Time::gmtime::gmtime; print "Date is: ", join('/',$time->mday,($time->mon+1),($time->year+1900)), "\n";
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11; see also Time::tm
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Time::localtime
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This module overrides the built-in localtime function with one that returns an object based on the Time::tm module The individual methods within the returned object are the individual fields of the new time structure For example:
use Time::localtime; $time = localtime; print "Time is: ",join(':',$time->hour,$time->min,$time->sec),"\n";
The individual methods (fields) match the names of the struct tm structure, that is, sec, min, hour, mday, mon, year, wday, yday, and isdst
Appendix B:
Standard Perl Library
It s also possible to obtain the time from the last localtime call via predefined variables These variables have the same name as the structure fields and object methods with a tm_ prefix For example:
use Time::localtime qw(:FIELDS); localtime; print "Time is: ",join(':',$tm_hour,$tm_min,$tm_sec),"\n";
The time variables will not be updated until localtime is called again You can access the original CORE::localtime function in a scalar context using the new ctime function:
print ctime(time);
To use the object-oriented interface without overriding the CORE::localtime function, import the module with an empty import list, and then call the functions explicitly:
use Time::localtime qw//; $time = Time::localtime::localtime; print "Time is: ",join(':',$time->hour,$time->min,$time->sec),"\n";
References
11; see also Time::tm;
Time::tm
This module supports the internal functionality of the Time::localtime and Time::gmtime modules
References
See Time::localtime, Time::gmtime
APPENDIXES
UNIVERSAL
The UNIVERSAL module provides the base class from which all other classes are based This module provides the essential grounding for all blessed references within
Perl: The Complete Reference
Because all new objects inherit from the base class, the UNIVERSAL module also provides some base methods that are automatically inherited by all classes and objects Two of the methods, can and isa, are supported both as methods and functions:
isa(TYPE) UNIVERSAL::isa(REF, TYPE)
returns true if the object or REF is blessed into the package TYPE or has inherited from the package TYPE
can(METHOD) UNIVERSAL::can(REF, METHOD)
returns a reference to the subroutine supporting METHOD if METHOD is supported within the class of the object or REF If the specified method does not exist, then it returns undef
VERSION ([REQUIRE])
returns the contents of the $VERSION variable within the object s class If the REQUIRE value is specified, the script will die if REQUIRE is less than or equal to the $VERSION variable
Reference
10
User::grent
This module supports an object-oriented interface to the built-in getgr* functions:
use User::grent; $grent = getgrnam('staff');
Individual fields are then available as methods to the $grent object The supported methods are name, passwd, gid, and members This last item returns a reference to a list; the first three simply return scalars
Reference
11; see also User::pwent
Appendix B:
Standard Perl Library
User::pwent
This module provides an object-based interface to the built-in getpw* functions
use User::pwent; $pwent = getpwnam('root');
Once retrieved, individual fields of the password entry are available as methods to the newly created object For example,
print "User ID: ",$pwent->uid,"\n";
prints the uid of the root user The list of methods supported is name, passwd, uid, gid, quota, comment, gecos, dir, and shell
References
11; see also User::grent
utf8
The utf8 pragma tells Perl to use the UTF-8 (Unicode) character set for internal string representation The pragma is block scoped For most installations, there are no differences between Unicode and normal ASCII representation, since the first 128 characters of the ASCII code are stored within a single byte For patterns that are greater than this value, or for multibyte characters, the differences are significant
use utf8;
Once switched on, you can switch off Unicode operation with no:
no utf8;
The main effects of the module are as follows: I Strings and patterns may contain characters that have an ordinal value greater than 255 You can explicitly specify a Unicode character by specifying the hexadecimal prefix with braces and the Unicode character in a 2-byte hexadecimal string, for example \x{263A} I Symbol table entries within Perl may be specified in Unicode format
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